近十年来,特别是文化大革命以来,在大、中型贮木场卸、归、装等作业中,先后自行设计、制造了一批适于木材生产特点的装卸桥和龙门吊,尤其是用料较省的轻型桁架结构的装卸桥和龙门吊,发展十分迅速。目前,仍有不少贮木场正在进行设计、制造与吊装。为了适应这一需要,现将柴河、壮志两贮木场的有关装卸桥、龙门吊吊装的两种方法简介如下。1.中点吊装法将单龙门架杆置于主梁跨中重心处,龙门架杆的横向位置视起重机的形式而定,单梁单小车时,将主梁置于龙门架杆的两个立柱之间;双梁双小车的起重机,多为起吊长大件的货物而设计,两主梁间的间距较大,故龙门架杆的两个立柱通常置于两主梁之间。 Over the past decade, especially since the Cultural Revolution, a number of loading and unloading bridges and gantry cranes, which are suitable for the characteristics of wood production, have been designed and manufactured by the large and medium-sized stockyard unloading, returning and loading operations. In particular, Lightweight truss structure of the loading and unloading bridges and gantry crane, the development is very rapid. At present, there are still many storage yard are being designed, manufactured and hoisted. In order to meet this need, now Chaihe, ambitious two storage yard of the relevant loading and unloading bridge, gantry crane mounted two methods are as follows. 1. The mid-point hoisting method will single gantry pole placed in the center of gravity of the main girder, gantry crane horizontal position depending on the form of crane, single-beam single car, the main beam placed on the gantry pole two Between the pillars; Double-beam dual-car crane, mostly for the lifting of the cargo and the design of the two main beam spacing, so gantry pole two columns are usually placed between the two main beams.